Page 276 - ICSE Math 7

Self-Testing Exercise 5

MENSURATION

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1. Find the length of a rectangle with area 238 m and breadth 14 m.

2. A rectangular field is 150 m by 80 m. Find the cost of:
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(a) ploughing it at the rate of ` 12 per m .
(b) fencing it with wire at the rate of ` 22 per metre.
4 m 4 m
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3. Find the side of a square field with area 196 m . 2 m

6 m
4. Find the area of the unshaded part in the given figure.
2 m
20 m

5 cm
7 cm
5. Find the perimeter and area of the given figure if the
angle at each vertex is 90°. 4 cm

5 cm

3 cm
27 cm

6 cm
6. Find the area of the shaded part in the given figure. 30 cm

10 cm
5 cm

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7. The area of a triangle is 56 cm . Find the altitude corresponding to the side measuring 14 cm.

8. If the circumference of a circular sheet is 176 cm, find its radius and area.

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9. The area of a rhombus is 84 cm . If its perimeter is 48 cm, find its altitude.
10. Find the area of the trapezium ABCD, in which AB || CD, AE ⊥ CD, AB = 12 cm, CD = 8 cm,
and AE = 5 cm.

11. The adjacent sides of a parallelogram are in the ratio 4 : 3. If the longer of the two sides is
14 cm, find the perimeter of the parallelogram.

12. Find the area of the circle whose radius is 5.6 cm.

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